Primitive Technology: One guy, wearing only a pair of shorts, no music, no narration, just bird and forest sounds, as he creates shelters and items from the forest around him using prehistoric technology.
He started by building various types of shelters, then got into making pottery, bricks, and roof tiles, using clay from a nearby stream.
Currently, he's working on fire technology, creating hotter and hotter fires first to fire his clay objects to make them durable, and then to smelt iton.
Where does he get the metal? He harvested "iron bacteria" from the creek, and dried it fired it, and collected the tiny iron "prills". When he had enough, he went through a series of experiments to make his fire hot enough to melt the prills, and forge it into a tiny, rough, triangular knife.
Today, there are lots of copycats, mostly building elaborate shelters, but this guy is the OG. I mostly watch musical and political content, but Primitive Technology is the only channel I watch as soon as a new video drops. When the apocalypse arrives, I'll be ready.
Edit: Ever see someone start a fire by spinning a stick between his palms? This guy does it in almost every episode.